Problem: An alkaline battery produces electrical energy according to this equation: Zn + 2 MnO2 + H2O → Zn(OH)2 + Mn2O3a. Determine the mass of Zn(OH)2 produced if 25.0 g Zn and 30.0 g MnO2 are used.b. Determine the limiting and excess reactant.

FREE Expert Solution

Zn + 2 MnO2 + H2O → Zn(OH)2 + Mn2O3

Zn(OH)2 from Zn:

molar mass Zn = 65.39 g/mol
molar mass Zn(OH)2 = 99.41 g/mol

mass Zn(OH)2=25.0 g Zn×1 mol Zn65.39 g Zn×1 mol Zn(OH)21 mol Zn×99.41 g Zn(OH)21 mol Zn(OH)2

mass Zn(OH)2 = 38.0 g Zn(OH)2


Zn(OH)2 from MnO2

molar mass MnO2 = 86.94 g/mol
molar mass Zn(OH)2 = 99.41 g/mol

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Problem Details

An alkaline battery produces electrical energy according to this equation: Zn + 2 MnO2 + H2O → Zn(OH)2 + Mn2O3

a. Determine the mass of Zn(OH)2 produced if 25.0 g Zn and 30.0 g MnO2 are used.
b. Determine the limiting and excess reactant.

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